It's been tried in F-Class a few times with 14" twist barrels, but past 300 meters it wouldn't hold a candle to a .223 with VLD bullets. Everyone went to the Norma 6BR instead and 8" twist barrels and bypassed the 6PPC probably because of good Lapua brass, extra powder capacity and no need to neck turn. Without string shooting and waiting to machinegun those 5 rds in the wind condition might have something to do with it when 20 shots alternate pairs shooting is the game.
I know the Americans had quite of few PPC's and BR's in the praries where varmints rule, but maybe times have changed. It's true the BR crowd have a found a winner in the 6PPC because it's been a few decades and they quit experimenting with anything else. It just plain works, but like anything else it needs a custom chamber, tuned neck fit and top shelf barrel to make it perform optimally.